21211121022112 has 96 divisors (see below), whose sum is σ = 47886365358720. Its totient is φ = 9059784007680.

The previous prime is 21211121022101. The next prime is 21211121022127. The reversal of 21211121022112 is 21122012111212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21211121022112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115451668 + ... + 115635244.

It is an arithmetic number, because the mean of its divisors is an integer number (498816305820).

Almost surely, 2^{21211121022112} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21211121022112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23943182679360).

21211121022112 is an abundant number, since it is smaller than the sum of its proper divisors (26675244336608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21211121022112 is a wasteful number, since it uses less digits than its factorization.

21211121022112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185334 (or 185326 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21211121022112 its reverse (21122012111212), we get a palindrome (42333133133324).

The spelling of 21211121022112 in words is "twenty-one trillion, two hundred eleven billion, one hundred twenty-one million, twenty-two thousand, one hundred twelve".